{"id":"CVE-2025-8405","aliases":["BIT-gitlab-2025-8405","EUVD-2025-202646","GHSA-fjj2-x466-w3hx","UBUNTU-CVE-2025-8405"],"status":"published","title":"Improper Encoding or Escaping of Output in GitLab","description":"GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.","severity":{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00515,"percentile":0.44136,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-116"],"published":"2025-12-11T04:05:07Z","modified":"2026-11-03T22:13:16Z","fixes":[{"ecosystem":"Bitnami","package":"gitlab","fixed_in":["18.4.6","18.5.4","18.6.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"gitlab","ranges":[{"type":"SEMVER","events":[{"introduced":"17.1.0"},{"fixed":"18.4.6"},{"introduced":"18.5.0"},{"fixed":"18.5.4"},{"introduced":"18.6.0"},{"fixed":"18.6.2"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"gitlab","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.4.3+dfsg-9","8.4.3+dfsg-12","8.5.8+dfsg-5"]}],"products":[{"vendor":"gitlab","product":"gitlab"}],"references":[{"url":"https://gitlab.com/gitlab-org/gitlab/-/issues/558214","tags":["issue-tracking","permissions-required","Broken Link","web","report"]},{"url":"https://hackerone.com/reports/3270940","tags":["technical-description","exploit","permissions-required","Permissions Required","web","report"]},{"url":"https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/","tags":["Release Notes","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-8405","tags":["web","advisory"]},{"url":"https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released"},{"url":"https://github.com/advisories/GHSA-fjj2-x466-w3hx"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/8xxx/CVE-2025-8405.json","tags":["advisory"]},{"url":"git://git@gitlab.com:gitlab-org/gitlab.git","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2025-8405","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-8405","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2025-8405","title":"Improper Encoding or Escaping of Output in GitLab","description":"GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.","status":"published","published":"2025-12-11T04:05:07.234Z","modified":"2026-11-04T00:15:54.569Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-116"],"updated_at":"2026-11-04T01:48:19.902761Z"}],"euvd":[{"id":"EUVD-2025-202646","description":"GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.","status":"published","published":"2025-12-11T04:05:07Z","modified":"2026-11-04T00:15:54Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-04T02:55:42.668573Z"}],"ghsa":[{"id":"GHSA-fjj2-x466-w3hx","title":"GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18...","description":"GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.","status":"published","published":"2025-12-11T06:30:24Z","modified":"2025-12-11T06:30:32Z","cvss":[{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-116"],"updated_at":"2026-11-02T15:05:09.214908Z"}],"nvd":[{"id":"CVE-2025-8405","description":"GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.","status":"published","published":"2025-12-11T05:16:38.447Z","modified":"2026-10-14T21:10:00.183Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-116"],"updated_at":"2026-11-02T14:11:49.861863Z"}],"osv":[{"id":"CVE-2025-8405","title":"Improper Encoding or Escaping of Output in GitLab","description":"GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.","status":"published","published":"2025-12-11T04:05:07.234Z","modified":"2026-11-04T10:30:44.223287496Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-116"],"updated_at":"2026-11-04T11:07:25.0339Z"},{"id":"UBUNTU-CVE-2025-8405","description":"GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.","status":"published","published":"2025-12-11T05:16:00Z","modified":"2026-01-21T18:22:54.071641Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T16:55:55.926217Z"},{"id":"BIT-gitlab-2025-8405","title":"Improper Encoding or Escaping of Output in GitLab","description":"GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.","status":"published","published":"2025-12-18T12:06:48.009Z","modified":"2026-09-08T08:48:11.70492201Z","updated_at":"2026-11-02T15:28:30.70064Z"}]}}